Tire-pump



c. A DE RIGNE.

une P UMP.'

APPLICATION FILED DEC. 2. 1918.

Patented Nov. 25, 1919.

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v Specification `of Letters Patent.

Y Patented-rilevi.

l Application tiled December 2, 1918. Sera1-No.v264,948. Y

script-ion of the invention, suoliv as will en 7 able others skilled in they art to which it appertains, tomake and use thessame. v

My invention relates to improvements in Vair pumps and more -particularly to those designed for inlating pneumatic q tires. The object of the inventionLisfaprovide a pump of comparatively simple .and inexpensive construction, yet one which will be highly efficient and easy to operate, provision being made whereby an extremely large area is allowed for the air to pass into the cylinder in front of the piston as the latter is moved on its receding stroke.

lilith the foregoing object in view, the invention resides in the novel eatures'of construction and unique association of parts hereinafter fully described and claimed, rei:- erence being made to the accompanying drawing which forms a part of this application.

n the drawing 'Figure l is aY vertical longitudinalsection of the pump and Fig. 2 is a transverse horizontal section on the plane of the line 2-2 of Fig. l.

In the drawing above briefly described,v

the numeral 1 designates a pump cylinder whose lower Vend is shown mounted in a threaded socket 2 having a foot piece 3, an outlet nipple lbeing provided from a chamber 5 in the bottom oi' the socket 2, and theusual exible tube 6 leads from the nipple 4 for attachment to the tire valve. The upper end of cylinder l is provided with a cap 7 suitably secured in' place and provided with a central opening S and with a number or' apertures 9, the latter being for the purpose of permit-ting the intake and discharge of air into the cylinder as the pump piston is reciprocated, thereby preventing the compression of air above the piston or thel creation of a partial vacuum,

i either of which would retard the operation of the pump.

A hollow piston head1() is provided in the cylinder l, the periphery of said head being provided near its upper end'with an external shoulder ll against which the inwardly turnededo'e of a packingring 112 1 is clamped by'ineans ofacollar which surrounds the headsaid collar being'interposed betweenV the packing and head as shown. A nut i4 is shown for the purpose [l l n i oi securing the collar 13 iii-place, but other adequate provision might well be made forl this purpose.` The upper end'oitlie-piston head '10 is provicied-with-a hollow neck l5 into which the lower end of a ,tubularpistoured/16 issthreaded, saidhead passing slidablythrongh theopening-S, and Ybeing connected by atubular'plug 17 with-:a

l handle 18- yAt 19, the rod 16 yis,periforated So thatgas the. handley is raised5 air will enter the` pli-mp 'throughv these peroratons 1 and through lthe tubular plug 17, such Vair traveling through the head l0 to be compressed by the piston on its descendingstroke.

novel arrangement otvalves is provided in Y the pistonA to allow' the air to descend but to prevent any upward leakage when the piston is depressed.

The valve arrangement above mentioned rlhe bottom orV is preferably as shown.

lower end 20 of the piston head v10 is p roy vided with a cone valve seat 21 facingy downwardly, and above said bottom the head is provided with a spider 22. A conexor pup! pet valve 23 engages the seat 2l and is' provided with a tubular steni 24:risi1ig.into

.the head l0 and guided by the spider 22,

a spring 25 being provided around said stem to normally close the valve.- One end of the spring preferably vabuts the spider 22 while the other end thereof bears against` aV pin or the like 26 carried by the stem 24, At its center, the lower side of valve 23 is provided with a conel valve seat 27, and above this seat with a spider 28, said seat receiving a relatively small cone valve 29 whose stem 30 slides within the spider 28 and is provided with a spring 3l engaging said spider to normally seat the valve.

By the provision of the. valve structure above described, when the piston is raised,

both valves 23 and 29 will open, thus providing an unusually large area through which the air may flow into the lower end of the cylinder. This causes extremely easy operation of thepump since the ascent of the piston encounters no resistance other than the friction of the piston upon the cylinder, which is infinitesimal. Also7 should one of the valves bind for anvreason and fail to openythe other will operate,A

thus preventing trouble and inconvenience which would otherwise be caused even though the binding were momentary'.

F rom the foregoing, taken in connection With the accompanying drawings, it Will be seen that although my invention is of simple and inenpensiveY nature, it will be highly eiiicient and in every1 Way desirable, and on account of the advantages derived therefrom, the construction shown and described is 91*elfenahle.V It is to be understood, however7 'that Within the scope ot the invention as claimed, numerous minor changes may well be made Without departing from or sacrilioing any advantages of the invention.

claim:

A pump piston comprising a one piece hollow cylindrical piston head having an outwardly facing Cone valve seat at yone end and an outwardly projecting tubular nook integral with its other end for the attachment or" a tubular pistonY rod a spider ex tending across said hollow piston head and having a central guide onening, a tubular valve stem sliding through said guide opening and havingl its inner end positioned loosely in said tubular neck and provided with a stop pin, the outer end of said tubular valve stem having an external cone valve and an internal cone valve seat, said valvecoacting With the seat ot' said piston head, a coiled spring surrounding said tuba lar valve lstern-between said spider and said stop for normally seating said cone valve, a second spider extending across said tubu lar valve stein and'having a central guide opening, a relatively small valve stem sliding through said guide opening of the second spider, a cone valve on the outer end of said relatively small stein for coaotion With the valve 'seat of said tubular stem, a stop on the inner end of said relatively small stem and a coil spring surrounding this stem between its stop and Uuiding spider.

tn testimony whereof I nave hereunto set niy hand.

CHARLES AUGUSTUS DE RIGNE. Witnesses:

A. H, RUGGLES, R. SWIFT. 

